Irish frozen foods brand Strong Roots has agreed to a $55m investment from McCain Foods as part of a strategic partnership between the two firms.

The deal will see Strong Roots gain access to McCain's global footprint to help expand its business to new countries and retailers.

McCain’s will take a minority stake in Strong Roots, with two members of its senior management team also set to join the Strong Roots board.

"What this deal allows us to do is access the resources and supply chain and distribution and manufacturing capability of an organisation like McCain Foods," Strong Roots founder and CEO Sam Dennigan told RTÉ News.

"The objective from the very beginning was to try to bring an Irish frozen food company global... so really this is setting ourselves up for the success that we've had the ambition for for six years," he added.

However, despite the links the deal will create, companies will continue to operate independently and compete directly with some product lines.

Mr Dennigan said that, while there was some overlap in products, the two brands were largely complimentary - with each serving different parts of the market.

Strong Roots was founded in 2015 and focuses on sustainable, plant-based frozen foods. Its products include sweet potato fries, kale and quinoa-based burgers and cauliflower hash browns.

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Its business has growth rapidly in the past six years, with its products now available in the US and UK, through retailers including Walmart and Wholefoods.

"Our operations in Ireland don't change that much - our HQ is based here, the majority of our employees are based here and that will continue to grow as a result," Mr Dennigan said.

"There are some markets in central Europe, Australasia, north America, south America that we've had our eyes on but not the resources or the capability to do.

"So from the global HQ of Ireland we're going to be able to service more regions, much more quickly, which is incredibly exciting for a brand that's only six years old."

Mr Dennigan said he and his management team remain in total control of the business following the deal, with the only changes to the board being the addition of two senior McCain employees.

"Everything else stays the same as it was before, except with this huge capacity for growth," he said.

Canada-headquartered McCain Foods is the world's largest manufacturer of frozen potato-based foods, with products available in 160 countries.

Its investment in Strong Roots is part of a recent push to expand its plant-based and sustainable operations.

It has already invested in a plant-based dairy alternative brand and the producer of plant-based alternatives to chicken nuggets.